78634680 has 32 divisors (see below), whose sum is σ = 235904400. Its totient is φ = 20969216.

The previous prime is 78634649. The next prime is 78634681. The reversal of 78634680 is 8643687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78634681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327525 + ... + 327764.

Almost surely, 2^78634680 is an apocalyptic number.

It is an amenable number.

78634680 is an abundant number, since it is smaller than the sum of its proper divisors (157269720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78634680 is a wasteful number, since it uses less digits than its factorization.

78634680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655303 (or 655299 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 78634680 is about 8867.6197482752. The cubic root of 78634680 is about 428.4216155734.

The spelling of 78634680 in words is "seventy-eight million, six hundred thirty-four thousand, six hundred eighty".